const { sprintf } = require('sprintf-js');

const codeToLanguageE_ = {};
codeToLanguageE_['aa'] = 'Afar';
codeToLanguageE_['ab'] = 'Abkhazian';
codeToLanguageE_['af'] = 'Afrikaans';
codeToLanguageE_['am'] = 'Amharic';
codeToLanguageE_['an'] = 'Aragonese';
codeToLanguageE_['ar'] = 'Arabic';
codeToLanguageE_['as'] = 'Assamese';
codeToLanguageE_['ay'] = 'Aymara';
codeToLanguageE_['az'] = 'Azerbaijani';
codeToLanguageE_['ba'] = 'Bashkir';
codeToLanguageE_['be'] = 'Byelorussian';
codeToLanguageE_['bg'] = 'Bulgarian';
codeToLanguageE_['bh'] = 'Bihari';
codeToLanguageE_['bi'] = 'Bislama';
codeToLanguageE_['bn'] = 'Bangla';
codeToLanguageE_['bo'] = 'Tibetan';
codeToLanguageE_['br'] = 'Breton';
codeToLanguageE_['bs'] = 'Bosnian';
codeToLanguageE_['ca'] = 'Catalan';
codeToLanguageE_['co'] = 'Corsican';
codeToLanguageE_['cs'] = 'Czech';
codeToLanguageE_['cy'] = 'Welsh';
codeToLanguageE_['da'] = 'Danish';
codeToLanguageE_['de'] = 'German';
codeToLanguageE_['dz'] = 'Bhutani';
codeToLanguageE_['el'] = 'Greek';
codeToLanguageE_['en'] = 'English';
codeToLanguageE_['eo'] = 'Esperanto';
codeToLanguageE_['es'] = 'Spanish';
codeToLanguageE_['et'] = 'Estonian';
codeToLanguageE_['eu'] = 'Basque';
codeToLanguageE_['fa'] = 'Persian';
codeToLanguageE_['fi'] = 'Finnish';
codeToLanguageE_['fj'] = 'Fiji';
codeToLanguageE_['fo'] = 'Faroese';
codeToLanguageE_['fr'] = 'French';
codeToLanguageE_['fy'] = 'Frisian';
codeToLanguageE_['ga'] = 'Irish';
codeToLanguageE_['gd'] = 'Gaelic';
codeToLanguageE_['gl'] = 'Galician';
codeToLanguageE_['gn'] = 'Guarani';
codeToLanguageE_['gu'] = 'Gujarati';
codeToLanguageE_['ha'] = 'Hausa';
codeToLanguageE_['he'] = 'Hebrew';
codeToLanguageE_['hi'] = 'Hindi';
codeToLanguageE_['hr'] = 'Croatian';
codeToLanguageE_['hu'] = 'Hungarian';
codeToLanguageE_['hy'] = 'Armenian';
codeToLanguageE_['ia'] = 'Interlingua';
codeToLanguageE_['id'] = 'Indonesian';
codeToLanguageE_['ie'] = 'Interlingue';
codeToLanguageE_['ik'] = 'Inupiak';
codeToLanguageE_['is'] = 'Icelandic';
codeToLanguageE_['it'] = 'Italian';
codeToLanguageE_['iu'] = 'Inuktitut';
codeToLanguageE_['ja'] = 'Japanese';
codeToLanguageE_['jw'] = 'Javanese';
codeToLanguageE_['ka'] = 'Georgian';
codeToLanguageE_['kk'] = 'Kazakh';
codeToLanguageE_['kl'] = 'Greenlandic';
codeToLanguageE_['km'] = 'Cambodian';
codeToLanguageE_['kn'] = 'Kannada';
codeToLanguageE_['ko'] = 'Korean';
codeToLanguageE_['ks'] = 'Kashmiri';
codeToLanguageE_['ku'] = 'Kurdish';
codeToLanguageE_['ky'] = 'Kirghiz';
codeToLanguageE_['la'] = 'Latin';
codeToLanguageE_['ln'] = 'Lingala';
codeToLanguageE_['lo'] = 'Laothian';
codeToLanguageE_['lt'] = 'Lithuanian';
codeToLanguageE_['lv'] = 'Lettish';
codeToLanguageE_['mg'] = 'Malagasy';
codeToLanguageE_['mi'] = 'Maori';
codeToLanguageE_['mk'] = 'Macedonian';
codeToLanguageE_['ml'] = 'Malayalam';
codeToLanguageE_['mn'] = 'Mongolian';
codeToLanguageE_['mo'] = 'Moldavian';
codeToLanguageE_['mr'] = 'Marathi';
codeToLanguageE_['ms'] = 'Malay';
codeToLanguageE_['mt'] = 'Maltese';
codeToLanguageE_['my'] = 'Burmese';
codeToLanguageE_['na'] = 'Nauru';
codeToLanguageE_['nb'] = 'Norwegian';
codeToLanguageE_['ne'] = 'Nepali';
codeToLanguageE_['nl'] = 'Dutch';
codeToLanguageE_['no'] = 'Norwegian';
codeToLanguageE_['oc'] = 'Occitan';
codeToLanguageE_['om'] = 'Oromo';
codeToLanguageE_['or'] = 'Oriya';
codeToLanguageE_['pa'] = 'Punjabi';
codeToLanguageE_['pl'] = 'Polish';
codeToLanguageE_['ps'] = 'Pushto';
codeToLanguageE_['pt'] = 'Portuguese';
codeToLanguageE_['qu'] = 'Quechua';
codeToLanguageE_['rm'] = 'Rhaeto-Romance';
codeToLanguageE_['rn'] = 'Kirundi';
codeToLanguageE_['ro'] = 'Romanian';
codeToLanguageE_['ru'] = 'Russian';
codeToLanguageE_['rw'] = 'Kinyarwanda';
codeToLanguageE_['sa'] = 'Sanskrit';
codeToLanguageE_['sd'] = 'Sindhi';
codeToLanguageE_['sg'] = 'Sangho';
codeToLanguageE_['sh'] = 'Serbo-Croatian';
codeToLanguageE_['si'] = 'Sinhalese';
codeToLanguageE_['sk'] = 'Slovak';
codeToLanguageE_['sl'] = 'Slovenian';
codeToLanguageE_['sm'] = 'Samoan';
codeToLanguageE_['sn'] = 'Shona';
codeToLanguageE_['so'] = 'Somali';
codeToLanguageE_['sq'] = 'Albanian';
codeToLanguageE_['sr'] = 'Serbian';
codeToLanguageE_['ss'] = 'Siswati';
codeToLanguageE_['st'] = 'Sesotho';
codeToLanguageE_['su'] = 'Sundanese';
codeToLanguageE_['sv'] = 'Swedish';
codeToLanguageE_['sw'] = 'Swahili';
codeToLanguageE_['ta'] = 'Tamil';
codeToLanguageE_['te'] = 'Telugu';
codeToLanguageE_['tg'] = 'Tajik';
codeToLanguageE_['th'] = 'Thai';
codeToLanguageE_['ti'] = 'Tigrinya';
codeToLanguageE_['tk'] = 'Turkmen';
codeToLanguageE_['tl'] = 'Tagalog';
codeToLanguageE_['tn'] = 'Setswana';
codeToLanguageE_['to'] = 'Tonga';
codeToLanguageE_['tr'] = 'Turkish';
codeToLanguageE_['ts'] = 'Tsonga';
codeToLanguageE_['tt'] = 'Tatar';
codeToLanguageE_['tw'] = 'Twi';
codeToLanguageE_['ug'] = 'Uighur';
codeToLanguageE_['uk'] = 'Ukrainian';
codeToLanguageE_['ur'] = 'Urdu';
codeToLanguageE_['uz'] = 'Uzbek';
codeToLanguageE_['vi'] = 'Vietnamese';
codeToLanguageE_['vo'] = 'Volapuk';
codeToLanguageE_['wo'] = 'Wolof';
codeToLanguageE_['xh'] = 'Xhosa';
codeToLanguageE_['yi'] = 'Yiddish';
codeToLanguageE_['yo'] = 'Yoruba';
codeToLanguageE_['za'] = 'Zhuang';
codeToLanguageE_['zh'] = 'Chinese';
codeToLanguageE_['zu'] = 'Zulu';

const codeToLanguage_ = {};
codeToLanguage_['an'] = 'Aragonés';
codeToLanguage_['da'] = 'Dansk';
codeToLanguage_['de'] = 'Deutsch';
codeToLanguage_['en'] = 'English';
codeToLanguage_['es'] = 'Español';
codeToLanguage_['fr'] = 'Français';
codeToLanguage_['he'] = 'עיברית';
codeToLanguage_['it'] = 'Italiano';
codeToLanguage_['lt'] = 'Lietuvių kalba';
codeToLanguage_['nl'] = 'Nederlands';
codeToLanguage_['pl'] = 'Polski';
codeToLanguage_['pt'] = 'Português';
codeToLanguage_['ru'] = 'Русский';
codeToLanguage_['sk'] = 'Slovenčina';
codeToLanguage_['sq'] = 'Shqip';
codeToLanguage_['sr'] = 'српски језик';
codeToLanguage_['tr'] = 'Türkçe';
codeToLanguage_['ja'] = '日本語';
codeToLanguage_['ko'] = '한국어';
codeToLanguage_['sv'] = 'Svenska';
codeToLanguage_['el'] = 'Ελληνικά';
codeToLanguage_['zh'] = '中文';
codeToLanguage_['ro'] = 'Română';
codeToLanguage_['et'] = 'Eesti Keel';
codeToLanguage_['vi'] = 'Tiếng Việt';
codeToLanguage_['hu'] = 'Magyar';

const codeToCountry_ = {};
codeToCountry_['BR'] = 'Brasil';
codeToCountry_['CR'] = 'Costa Rica';
codeToCountry_['CN'] = '中国';
codeToCountry_['GB'] = 'UK';
codeToCountry_['US'] = 'US';

let supportedLocales_ = null;
let localeStats_ = null;

const loadedLocales_ = {};

const defaultLocale_ = 'en_GB';

let currentLocale_ = defaultLocale_;

function defaultLocale() {
	return defaultLocale_;
}

function localeStats() {
	if (!localeStats_) localeStats_ = require('../locales/index.js').stats;
	return localeStats_;
}

function supportedLocales() {
	if (!supportedLocales_) supportedLocales_ = require('../locales/index.js').locales;

	const output = [];
	for (const n in supportedLocales_) {
		if (!supportedLocales_.hasOwnProperty(n)) continue;
		output.push(n);
	}
	return output;
}

function supportedLocalesToLanguages(options = null) {
	if (!options) options = {};
	const stats = localeStats();
	const locales = supportedLocales();
	const output = {};
	for (let i = 0; i < locales.length; i++) {
		const locale = locales[i];
		output[locale] = countryDisplayName(locale);

		const stat = stats[locale];
		if (options.includeStats && stat) {
			output[locale] += ` (${stat.percentDone}%)`;
		}
	}
	return output;
}

function closestSupportedLocale(canonicalName, defaultToEnglish = true, locales = null) {
	locales = locales === null ? supportedLocales() : locales;
	if (locales.indexOf(canonicalName) >= 0) return canonicalName;

	const requiredLanguage = languageCodeOnly(canonicalName).toLowerCase();

	for (let i = 0; i < locales.length; i++) {
		const locale = locales[i];
		const language = locale.split('_')[0];
		if (requiredLanguage == language) return locale;
	}

	return defaultToEnglish ? 'en_GB' : null;
}

function countryName(countryCode) {
	return codeToCountry_[countryCode] ? codeToCountry_[countryCode] : '';
}

function languageNameInEnglish(languageCode) {
	return codeToLanguageE_[languageCode] ? codeToLanguageE_[languageCode] : '';
}

function languageName(languageCode, defaultToEnglish = true) {
	if (codeToLanguage_[languageCode]) return codeToLanguage_[languageCode];
	if (defaultToEnglish) return languageNameInEnglish(languageCode);
	return '';
}

function languageCodeOnly(canonicalName) {
	if (canonicalName.length < 2) return canonicalName;
	return canonicalName.substr(0, 2);
}

function countryCodeOnly(canonicalName) {
	if (canonicalName.length <= 2) return '';
	return canonicalName.substr(3);
}

function countryDisplayName(canonicalName) {
	const languageCode = languageCodeOnly(canonicalName);
	const countryCode = countryCodeOnly(canonicalName);

	let output = languageName(languageCode);

	let extraString;

	if (countryCode) {
		if (languageCode == 'zh' && countryCode == 'CN') {
			extraString = '简体'; // "Simplified" in "Simplified Chinese"
		} else {
			extraString = countryName(countryCode);
		}
	}

	if (languageCode == 'zh' && (countryCode == '' || countryCode == 'TW')) extraString = '繁體'; // "Traditional" in "Traditional Chinese"

	if (extraString) output += ` (${extraString})`;

	return output;
}

function localeStrings(canonicalName) {
	const locale = closestSupportedLocale(canonicalName);

	if (loadedLocales_[locale]) return loadedLocales_[locale];

	loadedLocales_[locale] = Object.assign({}, supportedLocales_[locale]);

	return loadedLocales_[locale];
}

function setLocale(canonicalName) {
	if (currentLocale_ == canonicalName) return;
	currentLocale_ = closestSupportedLocale(canonicalName);
}

function languageCode() {
	return languageCodeOnly(currentLocale_);
}

function _(s, ...args) {
	const strings = localeStrings(currentLocale_);
	let result = strings[s];
	if (result === '' || result === undefined) result = s;
	try {
		return sprintf(result, ...args);
	} catch (error) {
		return `${result} ${args.join(', ')} (Translation error: ${error.message})`;
	}
}

function _n(singular, plural, n, ...args) {
	if (n > 1) return _(plural, ...args);
	return _(singular, ...args);
}

module.exports = { _, _n, supportedLocales, countryDisplayName, localeStrings, setLocale, supportedLocalesToLanguages, defaultLocale, closestSupportedLocale, languageCode, countryCodeOnly };
